To make this Banana Espresso Chocolate Chip Bread gluten free, replace the all-purpose flour with a reliable 1:1 gluten-free baking flour blend that includes xanthan gum or a similar binder. Also check that the espresso powder and chocolate chips are labeled gluten free, since some brands may vary or be processed in shared facilities. If your gluten-free flour blend does not already contain a binder, you may need to add a small amount of xanthan gum to help the loaf hold together properly. For anyone with celiac disease or severe gluten sensitivity, use clean bowls, utensils, loaf pans, and cooling racks to avoid cross-contact.